-/**
- * Start preview theme output buffer.
- *
- * Will only perform task if the user has permissions and template and preview
- * query variables exist.
- *
- * @since 2.6.0
- */
-function preview_theme() {
- if ( ! (isset($_GET['template']) && isset($_GET['preview'])) )
- return;
-
- if ( !current_user_can( 'switch_themes' ) )
- return;
-
- // Admin Thickbox requests
- if ( isset( $_GET['preview_iframe'] ) )
- show_admin_bar( false );
-
- $_GET['template'] = preg_replace('|[^a-z0-9_./-]|i', '', $_GET['template']);
-
- if ( validate_file($_GET['template']) )
- return;
-
- add_filter( 'template', '_preview_theme_template_filter' );
-
- if ( isset($_GET['stylesheet']) ) {
- $_GET['stylesheet'] = preg_replace('|[^a-z0-9_./-]|i', '', $_GET['stylesheet']);
- if ( validate_file($_GET['stylesheet']) )
- return;
- add_filter( 'stylesheet', '_preview_theme_stylesheet_filter' );
- }
-
- // Prevent theme mods to current theme being used on theme being previewed
- add_filter( 'pre_option_theme_mods_' . get_option( 'stylesheet' ), '__return_empty_array' );
-}
-
-/**
- * Private function to modify the current template when previewing a theme
- *
- * @since 2.9.0
- * @access private
- *
- * @return string
- */
-function _preview_theme_template_filter() {
- return isset($_GET['template']) ? $_GET['template'] : '';
-}
-
-/**
- * Private function to modify the current stylesheet when previewing a theme
- *
- * @since 2.9.0
- * @access private
- *
- * @return string
- */
-function _preview_theme_stylesheet_filter() {
- return isset($_GET['stylesheet']) ? $_GET['stylesheet'] : '';
-}
-
-/**
- * Callback function for ob_start() to capture all links in the theme.
- *
- * @since 2.6.0
- * @access private
- *
- * @param string $content
- * @return string
- */
-function preview_theme_ob_filter( $content ) {
- return $content;
-}
-
-/**
- * Manipulates preview theme links in order to control and maintain location.
- *
- * Callback function for preg_replace_callback() to accept and filter matches.
- *
- * @since 2.6.0
- * @access private
- *
- * @param array $matches
- * @return string
- */
-function preview_theme_ob_filter_callback( $matches ) {
- return $matches[0];
-}
-